I'm not even an electrician and I know that.
I'm guessing it was set up by someone that bid the job for a fixed price and didn't want to spend the time running a second line versus an electrician on an hourly rate.
Apparently they installed a new AC blower and didn't want to run a new wire 2 years ago so they switched it downstairs to turn on one or the other.
Makes a little sense but not really.
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